How to delete songs from iTunes?

I'm using iTunes 11. I just want to take a few songs off of my iPhone four, but when I delete them directly from my phone they aren't actually deleted. There's no option to delete them from my library online, so I don't know how to get rid of them. Please help! Thanks in advance!

Added (1). I don't want to music deleted from my account… Just my own iPhone

Plug your iPhone into your computer then delete it from your iTunes. Sync again, those songs will be deleted.

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